emitting substance
1Alexander Litvinenko poisoning — Alexander Litvinenko was a former officer of Russian Federal Security Service, who escaped prosecution in Russia and received a political asylum in Great Britain. He authored two books, and Lubyanka Criminal Group, where he accused Russian secret …
2Cavity magnetron — Magnetron with section removed (magnet is not shown) …
3Self-powered lighting — is a generic term describing devices that emit light continuously without an external power source. Self powered lighting is most frequently used on wristwatches (i.e. Night watches), gun sights, and certain emergency and tactical equipment.Early …
4Spectral bands — are part of optical spectra of polyatomic systems, including condensed materials, large molecules etc. Each line corresponding to one level in atom splits in molecules. When the number of atoms is large, one gets continuum of energy levels, so… …
5Molecular spectra or band spectra — Band spectra is the name given to group of lines so closely spaced and arranged in regular sequence that appears to be a band. It is coloured band separated by dark space on the two sides and arranged in regular sequence. In one band there are… …
6emissionspectrum — emission spectrum n. The spectrum of bright lines, bands, or continuous radiation characteristic of and determined by a specific emitting substance subjected to a specific kind of excitation. * * * …
7electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
8luminescence — luminescent, adj. /looh meuh nes euhns/, n. 1. the emission of light not caused by incandescence and occurring at a temperature below that of incandescent bodies. 2. the light produced by such an emission. [1885 90; < L lumin (see LUMEN) +… …
9Radioactive waste — 2007 ISO radioactivity danger logo, designed in part for long term radioactive waste depositories which might survive into a far future time in which all knowledge of the meaning of present common radiation danger symbols and signs has been lost… …
10Radioactive decay — For particle decay in a more general context, see Particle decay. For more information on hazards of various kinds of radiation from decay, see Ionizing radiation. Radioactive redirects here. For other uses, see Radioactive (disambiguation).… …
